OP-II-3

PP-I-57KINETIC REGULARITIES OF N-BUTANE ISOMERIZATION OVERMORDENITE-ZIRCONIA CATALYSTTagiyev D.B., Starikov R.V.Institute of Petrochemical Processes of Azerbaijan NAS, dtagiyev@hotmail.comIntroductionIt has been shown in publications [1, 2] that promotion of dealuminated mordeniteby zirconia and sulfate-ions results in a considerable increasing of zeolite isomerizingactivity and allows to perform isomerization of n-butane at lower temperatures. Theresults of investigation of kinetic regularities of the process essential forunderstanding of action mechanism of sulfated mordenite-zirconia catalysts inn-butane isomerization are presented in the given paper.ExperimentalThe kinetics study of reaction was carried out in a flow microreactor at 0.1MPapressure and temperature range 473-513 K. Before testing a catalyst was heated in adry air stream at 773 K for 3 hours. Partial pressures of n-butane and hydrogen werevaried in the range 0.01-0.08 and 0.01-0.04 MPa, respectively. For ensuring ofvelocity constancy of gas stream nitrogen was used as an inert diluent. The productsof reaction were analyzed by gas chromatography method.Results and discussionThe dependences of main products formation velocities of n-butane conversion(isobutane, isopentane, propane) on partial pressures of reactants were determinedat moderate conversion of n-butane, i.e. in the range of pseudo zeroth order ofreaction. The obtained results are presented in Table 1 at temperature of 473 K.Table 1. Influence of reactants partial pressures on n-butane conversion and reaction rate(temperature - 473 K, stream rate - 500 ml·h –1 )Partial pressures, MPaConversion ofReaction rate, W i·10 4 –1mole·g–1·hP n − C 4 H P10 H 2n-butane, % isobutane isopentane propane0.01 0.01 2.6 0.28 0.04 0.030.02 0.01 2.9 0.67 0.09 0.060.04 0.01 3.2 1.41 0.23 0.170.06 0.01 3.7 2.46 0.35 0.270.08 0.01 5.1 4.58 0.470 0.470.01 0.02 1.9 0.21 0.03 0.020.01 0.04 1.4 0.15 0.02 0.01320